12 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



These are followed in frequency by : 



The above-mentioned species, twenty-seven in all, represent 

 those most usually found in English and Continental gardens, many 

 of them under a multiplicity of names. In identifying a garden 

 Sedum, if it will not fit the figure and description which are given 

 under the name in the present paper, or if the name under which' it 

 was received does not appear in the Index, it will be well, first, to 

 compare it with the figures and diagnostic notes relating to the seven 

 species first mentioned. If it clearly cannot be matched there, there 

 is a great probabihty that it belongs to the second or third hst 

 given above. 



In many cases the quickest way of " running down " a plant will 

 be found to be to match it roughly by eye by a rapid survey of the 

 illustrations, and then to turn to the description of the suspected 

 species for confirmation. In doing this, the following species may for 

 practical purposes be ruled out, as being extremely rare, and known 

 in Great Britain in only two or three (mostly pubhc) collections : 



Species very rare in Cultivation. 



adenotrichum 



alpestre 



alsinejolium 



bhutanense 



bupleuroides 



cauticolum 



Cepaea 



dumulosum 



elongatum 



fiorijerum 



gracile 



gyPsicolum 



heterodontiim 



himalense 



hirsutum 



longicaule 



monregalenss 



multicaule 



Praegerianum 



pruinatum 



pseudospectabile 



purpureoviride 



quadrifidum 



rhodanthum 



rubroslaiicum 



Selskianum 



Semenovii 



stellatum 



Stevenianum 



Stribrnyi 



Taquetii 



Tatarinowii 



tibeticum 



verticillatum 



villosum 



yosemitense 



yunnanense 



Also all the Mexican species, with the exception of praealtum, 

 moranense, and Stahlii ; and some Indian, Chinese, and Japanese 

 species, including the Japonica series of Maximowicz and a few 

 others : 



Celiac 



Chaneti 



Chauveaudi 



Jormosanum 



indiciim 



japonicum 



Leblancae 



lineare 



multicaule 



sarmentosum 



Someni 



trullipetalum 



variicolor 



viscosum 



Zentaro-Tashiroi 



And, lastly, the plants listed on p. 5, which though they are or 

 were in cultivation. I have not succeeded in seeing. 



